Schorl and quartz crystals in groundmass
Elbaite on albite and quartz
Schorl tourmaline crystal stone
Black tourmaline in mica schist
Tourmaline schorl specimen
Tourmaline crystals in quartz
Hawk's Eye quartz stone
Tourmaline on quartz
Tourmaline in pegmatite host rock
Tourmaline in gneiss rock
Tourmaline crystals in quartzite
Quartz and green tourmaline crystals
Tourmaline quartz
Tourmaline in quartz
Tourmaline
Schorl (black Toutmaline)
Schorl variety of Tourmaline, Namibia
Graphic tourmaline, light micrograph
Indicolite tourmaline faceted stone
Watermelon tourmaline crystalline stone
Rubellite tourmaline pendant
Tourmaline crystal specimen
Tourmaline crystal specimens
Watermelon tourmaline
Elbaite mineral
Dravite mineral
Tourmaline embedded in feldspar rock
Elbaite mineral (tourmaline)
Opal gem necklace
Heat-treated amethyst
Childrenite crystal in quartz
Sapphire crystals in rock groundmass
Granite specimen
Tourmaline Pegmatite
Spine crystals in quartz groundmass
Tourmaline gemstone
Sphene crystals in groundmass, close-up
Tourmaline gemstones in quartz
Richterite in quartz groundmass
Gold embedded in quartz groundmass
Pyrophyllite and quartz in groundmass
Green hemimorphite in groundmass
Olivenite in quartz groundmass, close-up
Bournonite in quartz groundmass, close-up
Opalised fossil
Raw tourmaline crystal
Tourmaline gemstones and crystal
Tourmaline crystal, thin section
Tourmaline crystal
Bi-coloured tourmaline crystals
Luxulyanite, thin section, LM
Quartz crystals
Smoky quartz crystals
Riebeckite crystals in groundmass
Rough pinkish-red Rubellite
Clinochlore crystals in rock groundmass
Fire opal
'Black' opal cabochon specimen
Ironstone matrix with potch opal
Mineral samples
Opal
Tourmaline cross section
Amethyst
Verdite green tourmaline gemstone
Tourmaline unworked stones
Blue sapphire stone
Blue Sapphire uncut stone
Jade stone
Amethyst geode
Garnet gemstone
Amethyst filled geode
Amethyst geode interior
Amethyst and chalcedony
Prismatic amethyst crystal
Amethyst crystals
Rare bright green Uvarovite Garnet
Tourmaline specimen
Mylonite, light micrograph
Magnesite crystals in groundmass
Dioptase crystals in groundmass
Glaucodot crystals in groundmass
Wedge shaped titanite crystal
Vanadinite crystals in rock groundmass
Scapolite crystals in rock groundmass
Rhodonite crystals in rock groundmass
Bismuthinite crystals in rock groundmass
Sylvanite crystals in calcite groundmass
Muscovite crystals in rock groundmass
Rose quartz mineral, artwork
Pink tourmaline crystals growing on mica
Crystals of green toumaline and pink lepidolite
Microcline in rock groundmass
Quartz types
Geode, thin section micrograph
Aegirine crystal in rock groundmass
Schorl, the black variety of Tourmaline
Chalcopyrite and quartz crystals
Galenite and quartz crystals
Chabazite crystals in quartz
Quartz encrusted calcite crystals
Orthoclase and quartz crystals
Prismatic parallel crystals of allanite
Garnet crystals on schist
Almandine crystals in schist
Quartz filled concretion
Quartz vein in granite
Crystals of haematite in quartz
Amethyst geodes
Deformed quartz veins in slate
Herkimer diamonds of quartz mineral
Citrine
Celestine crystals in sulphur groundmass
Citrine crystals
Crystalline hemimorphite in groundmass
Franklinitein calcite groundmass
Molybdenite in granite groundmass
Quartz
Tourmaline crystals
Tabular stilbite on rock groundmass
Green apophyllite in stilbite groundmass
Prehnite and calcite in groundmass
Staurolite in mica schist groundmass
Tourmaline crystals in matrix
Tourmaline crystals on Albite
Blue tourmaline crystals
Citrine gemstones and crystal
Red-brown axinite in rock groundmass
Beryl in rock groundmass, close-up
Marcasite in chalk groundmass, close-up
Millerite in calcite groundmass, close-up
Tourmaline Crystals, Minas Gerais, Brazil
Fluorite crystals on quartz, close up
Kammererite crystals on groundmass
Microlite crystals in groundmass
Vivianite crystals in groundmass
Tourmaline gem, 365 carat
Tourmaline gem
Rubellite Tourmaline in Lepidolite Mica
Green Tourmaline in Muscovite, Maine
Tourmaline mineral, light micrograph
Tourmaline mica in slate
Tourmaline pegmatite
Blue benitoite and white natrolite
Amethyst crystals, light micrograph